block: Don't invalidate pagecache for invalid falloc modes

commit 1364a3c391aedfeb32aa025303ead3d7c91cdf9d upstream.

Only call truncate_bdev_range() if the fallocate mode is supported. This
fixes a bug where data in the pagecache could be invalidated if the
fallocate() was called on the block device with an invalid mode.

Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block devices")
Cc: stable@vger.kernel.org
Reported-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Fixes: line?  I've never seen those wrapped.
Link: https://lore.kernel.org/r/20231011201230.750105-1-sarthakkukreti@chromium.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sarthak Kukreti <sarthakkukreti@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/block_dev.c b/fs/block_dev.c
index a56974d0401047a3a5a40bc5e83654d2afb30478..a3f1fba18d64e896803d9a47d64eba10d70f073b 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -2033,21 +2033,26 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start,
        if ((start | len) & (bdev_logical_block_size(bdev) - 1))
                return -EINVAL;
 
-       /* Invalidate the page cache, including dirty pages. */
+       /*
+        * Invalidate the page cache, including dirty pages, for valid
+        * de-allocate mode calls to fallocate().
+        */
        mapping = bdev->bd_inode->i_mapping;
-       truncate_inode_pages_range(mapping, start, end);
 
        switch (mode) {
        case FALLOC_FL_ZERO_RANGE:
        case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
+               truncate_inode_pages_range(mapping, start, end);
                error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9,
                                            GFP_KERNEL, BLKDEV_ZERO_NOUNMAP);
                break;
        case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
+               truncate_inode_pages_range(mapping, start, end);
                error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9,
                                             GFP_KERNEL, BLKDEV_ZERO_NOFALLBACK);
                break;
        case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
+               truncate_inode_pages_range(mapping, start, end);
                error = blkdev_issue_discard(bdev, start >> 9, len >> 9,
                                             GFP_KERNEL, 0);
                break;